question, can ferocious rebel forces take the capital city, Baghdad? ABC's hamish Macdonald is there and has bhats happening now. Reporter: The extremist fighters are now edging closer to the capital and being met with firepower. There is resistance and small victories. Trying to fight back, battling to control the biggest oil refinery and vowing tonight to defend Baghdad. Iraqi soldiers fighting to uphold their shia dominated government from the Sunni militants. A division tearing this nation apart and this commander says there is only one sluice. Just one language now. This language. Reporter: Every vehicle has been bought, every soldier has been trained, and every weapon has been supplied using U.S. Taxpayers dollars. We'll only know if that money was well spent if these guys can prove they're ready to stand up to the threat from Isis. Adding to the mix today, 90 U.S. Military advisors arrived in Baghdad. Still, U.S. Secretary of state John Kerry telling ABC's Alex Marquardt that America will no longer fight Iraq's war. So you have to look to Iraq, to its government, its military, to be able to make the decisive difference here. Reporter: They'll need to do it quickly. At least 1,000 Iraqis have already been killed. In a month. And this fight promises only more blool bloodshed. Hamish mack Donald, Baghdad.

This transcript has been automatically generated and may not be 100% accurate.

{"id":24291055,"title":"Inside The Battle for Iraq","duration":"1:34","description":"Can Rebel Forces take the Capitol City of Baghdad?","section":"WNT","mediaType":"Default"}